package com.qltv.utils;

import java.io.InputStream;
import java.io.Writer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import com.qltv.message.resp.Article;
import com.qltv.message.resp.ImageMessage;
import com.qltv.message.resp.MusicMessage;
import com.qltv.message.resp.NewsMessage;
import com.qltv.message.resp.TextMsg;
import com.qltv.message.resp.VideoMessage;
import com.qltv.message.resp.VoiceMessage;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;

/**
 * 
 * 类名：MsgUtil
 * 描述：消息处理工具类
 * @author telnet
 * 创建时间：2018年1月10日
 */
public class MsgUtil {
	private static final Logger logger = Logger.getLogger(MsgUtil.class); 
	// 请求消息类型：文本
    public static final String REQ_MESSAGE_TYPE_TEXT = "text";
    // 请求消息类型：图片
    public static final String REQ_MESSAGE_TYPE_IMAGE = "image";
    // 请求消息类型：语音
    public static final String REQ_MESSAGE_TYPE_VOICE = "voice";
    // 请求消息类型：视频
    public static final String REQ_MESSAGE_TYPE_VIDEO = "video";
    // 请求消息类型：小视频
    public static final String REQ_MESSAGE_TYPE_SHORTVIDEO = "shortvideo";
    // 请求消息类型：地理位置
    public static final String REQ_MESSAGE_TYPE_LOCATION = "location";
    // 请求消息类型：链接
    public static final String REQ_MESSAGE_TYPE_LINK = "link";

    // 请求消息类型：事件推送
    public static final String REQ_MESSAGE_TYPE_EVENT = "event";

    /**
     *  事件类型：subscribe(订阅)
     */
    public static final String EVENT_TYPE_SUBSCRIBE = "subscribe";
    // 事件类型：unsubscribe(取消订阅)
    public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe";
    // 事件类型：scan(用户已关注时的扫描带参数二维码)
    public static final String EVENT_TYPE_SCAN = "scan";
    // 事件类型：LOCATION(上报地理位置)
    public static final String EVENT_TYPE_LOCATION = "LOCATION";
    // 事件类型：CLICK(自定义菜单)
    public static final String EVENT_TYPE_CLICK = "CLICK";

    // 响应消息类型：文本
    public static final String RESP_MESSAGE_TYPE_TEXT = "text";
    // 响应消息类型：图片
    public static final String RESP_MESSAGE_TYPE_IMAGE = "image";
    // 响应消息类型：语音
    public static final String RESP_MESSAGE_TYPE_VOICE = "voice";
    // 响应消息类型：视频
    public static final String RESP_MESSAGE_TYPE_VIDEO = "video";
    // 响应消息类型：音乐
    public static final String RESP_MESSAGE_TYPE_MUSIC = "music";
    // 响应消息类型：图文
    public static final String RESP_MESSAGE_TYPE_NEWS = "news";
    
    /**
     * 解析微信发来的请求（XML）
     * @param request
     * @return Map<String,String>
     * @throws Exception
     */
    public static Map<String,String> parseXml(HttpServletRequest request) throws Exception{
    	//解析的结果存储在HashMap中
    	Map<String,String> map = new HashMap<String,String>();
    	//从request中读取输入流
    	InputStream inputStream= request.getInputStream();
    	//读取输入流
    	SAXReader reader =new SAXReader();
    	Document document =reader.read(inputStream);
    	//得到xml根元素
    	Element root = document.getRootElement();
    	//得到根元素的所有子节点
    	@SuppressWarnings("unchecked")
		List<Element> elementList = root.elements();
    	//遍历所有子节点
    	for (Element element : elementList) {
			map.put(element.getName(), element.getText());
		}
    	//释放资源
    	inputStream.close();
    	inputStream = null;
    	//logger.info(map);
    	return map;
    }
    
    /**
     * 扩展xstream使其支持CDATA
     */
/*    private static XStream xstream = new XStream(new XppDriver() {
        public HierarchicalStreamWriter createWriter(Writer out) {
            return new PrettyPrintWriter(out) {
                // 对所有xml节点的转换都增加CDATA标记
                boolean cdata = true;

                
                @SuppressWarnings("rawtypes")
                public void startNode(String name, Class clazz) {
                    super.startNode(name, clazz);
                }
                protected void writeText(QuickWriter writer, String text) {
                    if (cdata) {
                        writer.write("<![CDATA[");
                        writer.write(text);
                        writer.write("]]>");
                    } else {
                        writer.write(text);
//                    	super.writeText(writer, text);
                    }
                }
            };
        }
    });*/
    private static XStream xstream = new XStream(new XppDriver(){
    	public HierarchicalStreamWriter createWriter(Writer out){
    		return new PrettyPrintWriter(out){
    			boolean cdata = true;
    			@SuppressWarnings("rawtypes")
				public void startNode(String name,Class clazz){
    				super.startNode(name, clazz);
    			}
    			protected void writeText(QuickWriter writer,String text){
    				if(cdata){
    					writer.write("<![CDATA[");
    					writer.write(text);
    					writer.write("]]>");
    				}else{
    					writer.write(text);
    				}
    			}
    		};
    	}
    });
    
    /**
     * 文本消息对象转换为xml
     * @param textMessage 文本消息对象
     * @return xml
     */
    public static String messageToXml(TextMsg textMessage){
    	xstream.alias("xml", textMessage.getClass());
//    	String aaa = xstream.toXML(textMessage);
//    	logger.info("MsgUtil处理后的字符串--->"+aaa);
    	return xstream.toXML(textMessage);
    }
    /**
     * 图片消息对象转换成xml
     * @param imageMessage 图片消息对象
     * @return
     */
    public static String messageToXml(ImageMessage imageMessage){
    	xstream.alias("xml", imageMessage.getClass());
    	return xstream.toXML(imageMessage);
    }
    /**
     * 语音消息对象转换成xml
     * 
     * @param voiceMessage 语音消息对象
     * @return xml
     */
    public static String messageToXml(VoiceMessage voiceMessage) {
        xstream.alias("xml", voiceMessage.getClass());
        return xstream.toXML(voiceMessage);
    }

    /**
     * 视频消息对象转换成xml
     * 
     * @param videoMessage 视频消息对象
     * @return xml
     */
    public static String messageToXml(VideoMessage videoMessage) {
        xstream.alias("xml", videoMessage.getClass());
        return xstream.toXML(videoMessage);
    }

    /**
     * 音乐消息对象转换成xml
     * 
     * @param musicMessage 音乐消息对象
     * @return xml
     */
    public static String messageToXml(MusicMessage musicMessage) {
        xstream.alias("xml", musicMessage.getClass());
        return xstream.toXML(musicMessage);
    }

    /**
     * 图文消息对象转换成xml
     * 
     * @param newsMessage 图文消息对象
     * @return xml
     */
    public static String messageToXml(NewsMessage newsMessage) {
        xstream.alias("xml", newsMessage.getClass());
        xstream.alias("item", new Article().getClass());
        return xstream.toXML(newsMessage);
    }
	
}
